<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<script>
			const PI = 3.14159;
			console.log(PI);	//3.14159
			PI = 3;
			console.log(PI);
			//TypeError:Assignment to constant variable.
		</script>
	</body>
</html>
